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24 Cards in this Set
- Front
- Back
random sample
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a sample in which all members of the accessible population had an equal chance of being selected
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probability sampling
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each individual in the population has a known probability of being selected
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simple random sample
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a sample selected from a population by a process that provides every sample of a a given size an equal probability of being selected
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systematic sampling
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a group of individuals obtained by taking every "nth" individual from a list containing the defined population
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stratified sampling
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selection of a sample so that certain subgroups in the population are adequately represented in the sample
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proportional stratified sampling
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the proportion of each subgroup in the sample is the same as their proportion in the population
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nonproportional stratified sampling
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an equal n sample from each subgroup in the sample regardless of proportion in the population
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cluster sampling
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the unit of sampling is a naturally occurring group of individuals
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multistage cluster sampling
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selecting clusters and then selecting individuals within these clusters
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convenience sampling
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selection of a sample that suits the purposes of the study and that is convenient; the strategy of selecting cases simply because they are available and easy to study
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extreme or deviant case sampling
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focuses on cases that are unusual or special
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intensity sampling
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involves selecting cases that manifest the phenomenon of interest intensely but not extremely
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typical case sampling
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involves the selection of typical cases to study
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maximum variation sampling
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selecting cases that illusttrate the range of variation in the phenomena to be studied
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stratified purposeful sampiing
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includes several cases at defined points of variation with respect to the phonomena being studied
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homogeneous sampling
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(opposite of maximum variation sampling) to select a sample of similar cases so that the particular group that the sample represents can be studied in depth
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critical case sampling
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selecting a single case that provides a crucial test of a theory, program, or other phenomenon
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snowball or chain sampling
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a group of cases that are selected by asking one person to recommend someone suitable as a case of the phenomenon of interest, who then recommends another person who is a suitable case or who knows of potential cases; the process continues until the desired sample size is achieved.
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criterion sampling
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the selection of cases that satisfy an important criterion
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theory-based or operational construct sampling
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used when the purpose of the study is to gain understanding of real-world manifestations of theoretical constructs
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confirming and disconfirming case sampling
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done to validate findings of previous research
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purposeful random sampling
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selecting a random sample using the methods of quantitiative research (used to establish that the sampling procedure is not biased)
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sampling politically important cases
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a strategy that might serve a useful purpose for the researcher or funding agency
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opportunistic sampling
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(Patton) the use of findings from one case to inform the researcher's selection of the next case for study
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